Device for measuring tapers.



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PATENTED MAY 31, 1904.

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G. P. HAZELT ON. DEVICE FOR MEASURING .TAPBRS.

. APPLICATION FILED JULY 3, 1902.

H0 IODEL.

No 761,378. PATENTED MAY 31, 1904.

.G. P. 'HAZELTON. DEVICE FOR MEASURING TAPERS.

' APPLICATION FILED JULY 3, 1902. 10 MODEL. 3 SHEETS-SHEET 2.

No. 7613.7 8. PATENTED M131, .1904.

a. P. HAZELTON. DEVICE FOR MEASURING TAPERS. j

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PAT NT OFFICE.

" FDEVICEIFOR MEASURING TAPERVS.

SPECIFiGATION forming -pa.rt of Letters Patent No. 761,378, dated May 31 1904. I

Application filed 'J'ulj 3, 1902 I To all whom it may concern;

Be it .known that LGEORGE P. HAZELTON, a citizen of the United States, residing at Newtonville, in the county of Middlese'x and State of Massachusetts, haveinvented new and useful Improvements in Device's for Measu ring Tapers, of which the following is a specification.

My invention has relation to new anduse: ful improvements in measuring devices or in-' struments, and more especially to instruments of that character or typefemployed for the purpose of measuring or ascertaining the'def gree of angleat'which converging lines or sur facesmeet.

' Theobject 'of'the 'inveiitionis to provide a devicepi" the character mentioned, which is s mple in construction, accurate and reliable in use, andwhi'chfmay beemployed for measuring'either the angles-of exterior-or interior surfaces of different tapered objects. I

The invention consists in the novel construction of the various'elements and their arrangement in operative com bination, toibe more fully described hereinafter; andthe novelty of which will be particularly pointed out and distinctly claimed. i

I have fully and clearly illustrated my in vention in the accompanying drawings, form mg. a part of this specification, and whereinposition for aseertainingthe'angle of the ex' te'rior surfaces of a'tapered object. Fig. gi's'f 5 a view in front elevation of the instrument,

' arms, showing the pointers in position thereon;

equipped withthe meansfor measuring interior surfaces. mentary' view of one'of the heads or slides. Fig. 5 is a plan view showing the measuringarms in adjusted position for ascertaining the angleof beveled edgesof a solid body Fig. 6 is a viewshowin g the fastening-clip for hold ing the pointers in position on the measuringarms Fig. 7 is adetail View of one of the and secured by means ofthe fastening-clip.

Fig. 4 is an enlarged frag Serial No. 114,270. (No model.)

Fig 8 1s a view showlng the reverse side of the arm as disclosed 1n Fig. 7, the fasten1ngclip beingremoved. Fig. 9 is a vlew showand Fig. 1 0 isa top plan view of the threaded bar employed for actuating and adjusting from a rigid bar of metal and of such length as may be desired or required. This beam is provided atone end with a rigid arm or jaw 2,.which is shown as being formed integral with the beam' 1 and which extends laterally at right angles thereto. The beam 1 is also prov'ided'with a movable jaw 3, which is slid-j v graduations whereby. the distance between the a slot 5, through which the beam 1 extends Z in a manner. well knownin' the art,s'aid slide ing provided whereby. the slide and jaw may Eits adjusted position. The scale onthe' beam is shown in inches, .and the movable jaw 3 has thereon a mark of 5 indication, as at 3, which coacts with the'scale for the purpose above mentioned that is, to ;determ'ine'the distance between the jaws. It

will beseen from the arrangementillustrated' w that the Zero-point onthe beam is a distance short of the fixed jaWand that when the movable jaw closely "engage s1 the fixed jaw the on the scale, and when the movable jaw is between the jaws will be accurately indicated by the mark 3 on the scale.

4 designates a supplementary slide which is arranged upon the beam 1 and, is movable the arm. Figl'll is a top plan View of one of.the bars for actuating the measuring-arms;

Referring to -the drawings, I designates a.

caliperarm' or beam, preferably constructed fixed and movable jaws may be ascertained or regulateid. 'lhe wjaw 3 {is rigidly secured in anysuitable manner to' a slide L'formedwith be clamped rigidly to the beam to hold it in mark thereon will 'c'oinoide'with the zero-mark:

ing a rnodified form of the measuring-arm and v the means for receiving the pomters thereto,

\ ably arranged upon the said; beam and is 1 adapted tobemoved toward or away from the l arm 2, the beam being provided with siiitable' ;being movabl e zalonglthe beam to adjust the position of 'th'emovable jaw,.a set-screw 5bej moved away from the fixed jaw the distance longitudinally thereof. This slide is positioned in the rear of the slide 4 and carries a threaded rod 30, one end of which engages the slide 4 in order that a fine adjustment of the arm 3 with relation to the arm 2 may be accomplished. This rod 30 is projected or retracted by means of a milled thumb-nut 31, which is arranged in a slot 32, formed in the slide 4. This slide is also provided with a fastening or clamping screw 6, by means of which the slide may be clamped to the beam before operating the screw-rod 30.

Upon the jaw or arm 2 is disposed a head or slide 7, which is movable lengthwise of the said arm and is provided with a clampingscrew 8, which is arranged to engage the arm 2 in order to hold the slide rigidly in the position to which it may be adjusted. This head or slide 7 is provided upon its inner end with an extended portion 9, which carries the elements of the invention employed for the purpose of ascertaining and measuring the angles of surfaces. This measuring device consists of an arm 10, which at a point intermediate its length is pivoted to the extended portion 9 of the slide, the pivoted means for the arm consisting of a fastening device or set-screw 11, which may be tightened for the purpose of clamping the arm in any position to which it may be swung on its pivot. This arm 10 is provided with an actuating means which is mounted upon the slide 7 and consists of a threaded bar 13, which projects through the said slide transversely thereto and is adapted to be projected and retracted by means of a milled nut 14, which is arranged in a slot 14 in the slide and through which the said threaded bar extends. At its outer end, or that end adjacent the arm 10, the threaded bar has pivotally mounted thereon a block 12, which is arranged within a bifurcation 13, Fig. 11, the arms of which extend upon either side of the arm 10, the block 12and said arm slidably engaging the arm 10, so that the block 12 will be permitted to move along said arm toward the upper end thereof as the bar 13 is projected for the purpose of swinging the arm 10 on its pivot.

Slidably arranged upon a laterally-extending arm 16, projecting from the sliding jaw 3, is a slide or head 15, which is similar in construction to the slide 7 and which also carries a measuring-arm 10 and actuating device therefor, said arm and device being identical in form and construction to those mounted on the slide 7. The heads 7 and 15 are so arranged upon the jaws 2 and 16 that the arms 10 will be directed inwardly and disposed oppositely with relation to each other, and each arm is provided or formed at the opposite end from that engaged by the block 12 with a head 19, having a straight edge 19, which extends at right angles to the longitudinal axis of the arm and parallel to the actuating-bar 13 when in its retracted position, as shown in dotted lines in Fig. 2.

The blocks 12 above described are each provided with a simple indicator-mark, as shown at 12, which coacts with a graduated scale 10, marked upon the arms 10 and by means of which the angle of the surface being measured is ascertained. As above stated, the arms 10 when in their normal position, as shown in dotted lines in Fig. 2, extend at right angles to the bars 13, and when in this position the mark upon the blocks will register with the zero of the scale on the arms, the straight edges of the heads 19 being parallel with the said bars. It will be seen that when the threaded bars 13 are actuated by the milled nuts 14 the arms will be swung on their pivots and that the blocks 12 will move along the said arms, the indicator-mark pointing out on the graduated scale the angle the straight edge 19 has assumed with relation to the actnati n gbar and the arms 2 or 3. The graduated scale upon the arms 10, as is obviously necessary to the purpose at hand, is made in the degrees of a circle; but these degrees are necessarily made so small that it would be practically unpossible to mark fractions of a degree which would be discernible to the naked eye. Therefore to overcome this difliculty I mark upon the periphery of the milled nut a scale of degrees and the fractional parts thereof, said scale being shown at 15, the graduations of which are adapted to register with an indicater-mark 7 on the heads, as shown in Fig. 2.

It will be seen that the device as just described is a ready and reliable means of ascertaining the angle of exterior tapered surfaces, the straight edges 19 being adapted to rest flush upon. the surfaces being measured and the angle of said straight edges being readily ascertained from the scales on the arms 10 and the milled nuts 14. The angles which the surfaces bear to each other may then be ascertained as a simple matter of mathematical calculation.

An important feature of the invention is the means provided for permitting the measurement of tapered interior surfaces as well as those which are exterior. This means will now be described. The heads of each of the arms 10 are provided with a suitable means whereby a pointer 22 may be secured thereto, which pointers are arranged and adapted to be inserted within a hollow object to measure the tapers thereof.

As embodyingthe preferred form of means for securing the pointers in position on the arms I have shown the heads 18 of said arms as being dovetail in form, which are adapted 'to be engaged by a dovetailed slot 20, Fig. 8.

formed in the sleeve 21, in which the pointer 22 is secured. The bore of these sleeves is made 21, which engages said heads, as shown in Fig.-7, whereby said sleeve will be'prevented from sliding'off the arm.

Onthe sides of each of the heads 7 and oppositeto that upon which the arms 10 are mounted are provided slotted projections 23 24, which are preferably formed integral with the heads and which carry set-screws 25 26,

respectively, which are adapted to'removably and adjustably secure a member 27, constituting a straight edge. employed for the purpose of providing a base against which an object being measured may be rested or have one of its sides placed during measurement of the other sides, the said straight edge being arranged at right angles to the jaws 2 and 3.

.forsecuring the pointers in position.

In Figs. 9 and 10 I have shown a modified form of the heads 18 of the arms and the means In this form the heads of the arms are providedwith tubular slots 18*, in which the ends of the pointers are seated and held by means of setscrews 29, arranged in the heads and adapted to impinge the pointers 22 to holdthe-latter securely in position. The straight edge of I the modified form is shown asconsisting of a flange 28, the face of which is adapted to engage the surface of the objectbeing measured.

The operation of the invention as above described is as follows:' The body to be measured is placed upon or rested against the straight edge 27, and the movable jaw 3 of the caliper is moved up to a point approximating one side of the taper body. This having been.

done, the milled nuts 14. are-turned to swing the arms '10 on their pivots, so that the straight edges 19 will be moved and adjusted so as to lie flat upon the surfaces being measured, The armsand thelr/ stralght edges having.

been adjusted, the thumb-nut 31 is then turned to force the movable jaw into close engagement with the object and the fastening-screws 11, screwed up to fasten the arms 10 in their adjusted position. The angles of the surfaces with reference to the arms 2 and 3 may be ascertained by means of the indications shown upon the graduated scales o'n-the arms 10 and the milled nuts 14:. t

If the instrument is to be employed merely as a gage in lathework and for-similar purposes, thestraight edge 27 is removed from This straight edge is.

on the arms.

=the:lugs and-the arms 10 may be adjusted to When it is desired to ascertain the angle of an interior-tapered surface, the sleeves 21,

carrying the pointers 22, are placed upon heads of the arms.

to be measured. The arms to which the pointers are connected are then swung on their The slide '3 is then. regulated with relation to the arm 2 in order that the said pointers may be inserted within the object thesurface may then be ascertained by refer- J ence to the scale on the arms and the thumbnuts 14:. r

What I claim, and desire to secure by Letters Patent, is

1. In a measuring instrument, the combination with a beam provided with jaws, of slides carried by the jaws, a measuring-arm pivoted to each slide, bars on each slide connected to the arm and means for projecting the bar to swing the arm on its pivot.

2'. Ina measuring instrument, the combina: tion with a beam provided with jaws, of slides carried by the jaws, a measuring-arm pivoted to each slide, a bar journaled on "each slide, one end of said bar slidably engaging the arm and means to actuate the bar.

3. Inameasuring instrument, the combination with a beam provided with jaws, of slides carried by the jaws, angle-measuring arms pivoted to the slides, means for swinging the arms on their pivots and coacting graduations on the arms and said means for indicating the angle to which the arms are moved.

4. In a measuring instrument the combination with a beam provided with jaws, of slides carried by the jaws, angle-measuring arms pivoted to the slides, means for swinging the arms on their pivots and removable pointers secured 5. In a measuring instrument, the combination with abeam provided with jaws, of slides carried by the jaws, angle-measuring arms piv- In a measuring instrument, the combina-x tion with a beam, provided with jaws, of slides 'carried by the jaws,angle-measuring arms pivoted to the slides, means to swing the arms on their pivots, pointers removably mounted on the arms, and fastening clips to secure said pointers in position.

7. In ameasuring instrument, the combination with a beam provided with jaws, of slides carried by the jaws angle-measuring arms pivoted to the slides, pointers removably mounted on the arms, and means to secure the pointers in position.

8. Ina measuring instrument the combination with a beam,of a slide, an angle-measuring 'arrn pivoted to the slide, means to adjust the arm. on its pivot, and coaeting graduations on the arm and said means to indicate the angle to which the arm is adjusted.

9. In ameasurlng instrument, the combination witha beam; of a slide. an angle-measuring arm pivoted to the slide, a threaded bar slidably disposed in the slide and engaging said arm and a nut for actuating said bar to swing the arm on its pivot.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE P. HAZELTON.

Witnesses:

J OSEPII P. SILsBY, JOHN H. W INsLow. 

